FT-IR investigation of the state of iron (III) chloride clusters confined in AOT reverse micelles dispersed in carbon tetrachloride

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Abstract

The state of the water-soluble salt iron(III) chloride in AOT reversemicelles dispersed in carbon tetrachloride has been investigated by FT-IR spectroscopy.Interestingly, while the entrapment of a lot of water-soluble inorganic saltsin AOT reverse micelles requires preliminarily the presence of significant amountsof water within the micellar core, solubilization of FeCl3 occurs without the need toadd water in the micellar solution reaching the very high solubility value, expressedas the maximum salt-to-surfactant molar ratio, of 1.30. The analysis of the spectralfeatures of the investigated samples leads to hypothesize that iron(III) chloride isconfined within the reverse micellar core as small size melted clusters of ionicspecies arising from the reactionsFeCl3 + FeCl3 -> FeCl2+ + FeCl4- FeCl3 + FeCl4- -> Fe2Cl7- accompanied by a marked structural rearrangement of the AOT head group domainsurrounding the micellar core and a shift of the sodium counterion from the micellarcore surface to its interior. This picture has been further corroborated byconductivity measurements of FeCl3/AOT/CCl4 solutions as a function of thesalt-to-surfactant molar ratio
Original languageEnglish
Pages (from-to)883-895
Number of pages13
JournalJournal of Cluster Science
Volume18
Publication statusPublished - 2007

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics

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